How many people are afraid to say what's really on their minds on facebook?

I think that you can say what's on your mind but you need to phrase things in such a way as to present your opinions without attacking another person for theirs. Everyone is entitled to an opinion - if you want good discussion you need opposing opinions. Some folks attack the person instead of the opinion. I see it get most out of hand on those topics like politics. I have very strong opinions in that arena and have to remind myself that their is a person on the end of that opinion that has a right to voice it just like I do. Sometimes I do well, sometimes not so much as I try to win them over to my way of thinking. :)